Pulp-screen.



N. HAGNANT.

` PULP soBBL'N.

nruouron funn um: 12. 1901. 909,006. Patented Jan. 5, 1909.

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N. MAGNANT.

PULP SCREEN. APPLICATION F'ILED JUNE 12. 1907. 909,006. Patented Jan 5, 1909.

f ZBHBETB-SHBET WJTNESSES.- z, k [N1/ENTOR- 'C LJJC NARCISSE MAGNANT, OF BERLIN, NEW HAMPSHIRE.

PULP-SCREEN.

Specification of Letters Patent.

Patented Jan. 5, 1909.

Application led June 12, 1907. Serial No. 378,582.

To all whom it may concern:

Be it known that I, NARCISSE MAGNANT, Aa citizen of the United States, residing at Berlin, in the county of Coos and State of New Hampshire, have invented certain New and useful Improvements in Pulp-Screens, of which the following is a specification.

'lhis invention relates to paper pulp screens and it has for its object to provide a device especially adapted for screenmg paper pulp in which the `pulp will pass readily `through the meshes of the screen without clogging.

Further objects of the invention are to simplify and to improve the construction and voperation of this class of devices.

With these and other ends in view which will readily appear as the nature of theinvention is better understood, the said invention consists in the combination with a screen trough 0r box of an improved, mechanically operated agitating device, operatingadjacent to the upper sideof the screen, whereby the pulp adjacent to the screen will be kept in a state of agitation, and the coarse particles and slivers will be prevented from settling upon and in the meshes of the screen, thereby clogging and obstructing the latter.

'.lhe invention further consists in the improved construction and manner of mounting and operating the said agitating device which will be hereinafter fully described and particularly pointed out in the claims.

In the accompanying drawings has been illustrated a simple and preferred form of the invention; it being, however, understood that no limitation is necessarily made to the precisestructural details therein exhibited,

ut that changes, alterations and modifications Within the scope of the invention may be resorted to when desired.

In the drawing-Figure 1 is a top plan view of a pulp screen embodying the invention. F ig. 2 is a longitudinal vertical sectional view taken on the line 2--2 in Fig. 1. Fig. 3 is a vertical transverse sectional view taken on the line 3-3 in Fig. 1. Fig. 4 is a perspective view showing the agitating frame or member, detached, in inverted position.

Corresponding parts in the several figures are to be noted bylike characters of reference.

The improved device comprises a rectangular box or trough 1 having a screen bottom 2, and which has been shown as supported upon legs or uprights 3, 3, at the corners thereof. Secured interiorly upon the side members of the box or trough 1 are longitudinal cleats 4, 4, extending through the entire length of the box; said cleats being mounted or secured directly adjacent to the upper side of the screen bottom 2.

lhe agitator consists of a frame F comprising side members 5, 5, connected by a plurality of cross bars 6, 6, which are secured upon the undersides of the side members; said cross bars being provided at the ends thereof with notches 7 engaging the guide cleats 4, so that the undersides or faces of the cross bars 6 will be disposed directly contiguous to the upper side or face of the screen bottom 2. 'l' e cross bars 6 are provided with horizontally disposed apertures or perforations 8 which are disposed longitudinally of the screen trough or box.

The side members 5 of the agitator frame are provided with longitudinal slots 9 wherein supporting Wheels 10 are mounted for rotation; said wheels being adapted to ride u on the upper sides of the guide cleats 4. Tliese Wheels are of such a diameter that the algitator frame will be supported thereby c osely adjacent to but free 'rom actual engagement with the parts of the trough; that 1s to say, the lower faces of the cross bars 6 will not be in actual contact with the screen bottom, and the notched ends of the cross bars 6 will not be in actual contact with the upper sides of the guide cleats, but will be supported closely adjacent thereto, but free from actual frictional contact. It follows that the agitator frame may be very easily reciprocated within the screen trough or box, with slight expenditure of power.

For the purpose of driving or reci rocating the agitator frame, mechanism as been shown including a driven shaft 11 supported for rotation in suitable bearings adjacent to the underside of the box; said shaft being equipped with a band pulley 12 for the purpose of receiving motion from a suitable source of power. A bracket 13 upon one end of the box supports a shaft 14 having a pulley 15 which is connected by a twisted belt 16 with a pulley 17 upon the shaft 11; the shaft 14 also carries a disk 18 having a Wrist pin 19 which is connected by pitman 20 with an upright 21 rising from one of the cross bars 6 of the agitator frame. It will be readily understood that the mechanism just described is merely illustrative of convenient means for imparting reciprocatory motion to the agitator frame, but that, within the scope of the invention, any suitable and well known means may be employed for this urpose.

Heretofore the contents of pu p screens has been agitated manually by means of a so-called rake provided for the purpose, in order to keep the meshes clear and unobstructed so as to permit the pulp to pass freely therethrough. This method has involved the constant labor of an attendant, and the result has been very unsatisfactory. By the present invention, the agitator is provided with a plurality of cross bars, each constituting a rake, and each operating upon a portion of the screen. rl`he perforations in said cross bars not only lessen the obstruction of the pulp to the movement of the agitator iframe, but the pulp will pass through said perforations in jets or streams which are effective in increasing the agitation, and cons'equently in preventing slivers and coarse particles from settling upon and becoming fixed in the meshes oi the screen. By mounting the agitator frame, as'herein described, free of actual contact with the screen, frietion is almost entirely avoided, and the agitator may be operated with a trifling expenditure of power. The guide cleats 4 are secured directly upon the frame of the box or trough, and the screen bottom will be relieved from any portion of the weight of lthe agitator.

This device is simple in construction, easily applied and operated, and thoroughly etlicient for the purposes for which it is provided.

claiml. A paper pulp screen, comprising a box or trough having a screen therein, guide cleats secured to the box 0r trough, an agitator frame having cross bars thereon, said cross bars being provided with perforations and cut away at the ends so as to provide a projection for securing them to the agitator i'rame and to allow them to extend below the upper surface of the guide cleats.

2. A paper pulp screen comprising a box or trough having a screen therein, guide cleats secured to the sides of the box or trough, an agitator frame having cross bars thereon, said cross bars being cut away at each end to allow them to extend below the upper-surface of the guide cleats, supporting wieels journaled upon the side members of the agitator vframe and means for reciprocating the agitator frame.

ln testimony whereof I atlix my signature, in presence oi two witnesses.

NARCSSE MAGNANT.

Witnesses:

P. E. BEAUDOIN, E. O. GILBERT. 

